Document Scanner and Rectifier
Use Document Scanner and Rectifier
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About this tool
Flatten and clean up document photos with perspective correction, smart or manual edge selection, and scan-style enhancement.
- 100% free with no usage limits
- No sign-up or login required
- Runs right in your browser
- Privacy-friendly and fast to use
Docs
Flatten and clean up document photos with perspective correction, smart or manual edge selection, and scan-style enhancement.
Core Features
- Perspective Correction: Uses four-corner perspective transformation to convert angled photos into front-facing views
- Contrast Enhancement: Built-in CLAHE adaptive histogram equalization for clearer pencil marks and faded text
- Manual Corner Marking: Click four corners on the image for precise control over the correction area
- Privacy Safe: Images are temporarily stored and automatically deleted after processing
- Cross-Platform: Pure web-based tool, works directly in your browser with no software installation
How to Use
- Upload the document or test paper photo to be corrected
- Click the four corner points in order (top-left -> top-right -> bottom-right -> bottom-left)
- Processing starts automatically once all four corners are marked
- Download the rectified image
Use Cases
- Correcting photos of test papers or homework for printing or archiving
- Perspective correction for photos of contracts, IDs, and documents
- Correcting whiteboard or blackboard content photos
- Book page photo correction
- Any scenario requiring conversion of angled document photos to front-facing views
Notes
- File size limit: 30MB
- Supported formats: JPG, PNG, WebP, BMP
- Mark corner points as accurately as possible on the actual document corners
- Manual marking is more precise than auto-detection and works well with complex backgrounds
Last verified: 2026-07-15
FAQ
Is it free?
Yes, completely free. No signup, no limits.
Why manual marking instead of auto-détection?
Manual marking is more précise and reliable than auto-détection, especially for test papers with complex backgrounds or uneven lighting. You control the exact correction area.
What formats are supported?
JPG, PNG, WebP, BMP. File size limit 30MB.
Will the result be clearer?
Yes, CLAHE contrast enhancement is applied automatically during rectification, making pencil marks and faded text much clearer.
Will images be saved?
No. Temporarily used during processing, automatically deleted afterwards.
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